The Nitecore P20 is a great combination of innovation and trustworthiness. Compact size for one handed operation and an intuitive interface ensures unprecedented ease of use. The Strobe Ready switch is designed around a lever principle, maximizing ease of use when wearing gloves. The Strobe Ready button has two models of operation: Press and hold in any state to enter strobe mode; or press with the light on to select a desired brightness level. With the light off, loosen and then tighten the bezel with the Strobe Ready switch being held to enter Strobe mode instantly The P20 will indicate a mode has been selected by different flashes: One flash for Tactical Mode, Two flashes for Law Enforcement Mode, or Three flashes for General Mode. Straightforwardly built for self-defense and fighting in no light. This setting provides only Strobe mode and turbo output. The MBM1618 battery magazine securely holds 2 x CR123 batteries thus increasing electrical conductivity and reliability by preventing battery movement. Every P20 unit is carefully inspected for quality before leaving the factory and has a unique serial number laser-etched onto its body making counterfeits a thing of the past. Water resistant in accordance with IPX-8 (two-meter submersible).